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Worcester-Bosch GREENSPRING CWi47 Manual

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Commissioning
GREENSPRING CWi47 – 6 720 646 322 (2015/04)
8.7 Functional requirements for cascade systems
8.7.1 Hot water requests
When a water heater reaches 80% of its capacity, it passes on
hot water requests to the next secondary water heater in the
system. Secondary acts like a primary to the next secondary.
When primary reach 30% of his capacity it will remove the
request sent to the secondary.
8.7.2 Water demand from solar
When the primary reads flow higher than 30 L/min and inlet
temperature is higher than set point, water will flow through the
appliance working with the solar function and the primary will
send a hot water request to the next Secondary in the system.
This way, when the appliances are in solar mode, the water flow
of the cascading system will not be restricted.
This function is reset when inlet temperature reaches set point
- 4
°C. Appliances will get out of solar mode and restart normal
operation.
8.7.3 Error handling
When one appliance in the cascading system is locked, due to
an error code, all actions are passed to the next appliance. If
the appliance is a primary, it will request to the next appliance
to be the primary.
In this case the damaged appliance must be turn OFF and the
cascading cables must be disconnect from the appliance. The
two connector ends must be connected, in order to close the
cascading circuit.
If the damaged appliance is the primary, another appliance
must be programmed to be the primary.
8.7.4 Operating hours
The operating hours of each appliance are visible in P4 mode in
menus H0, H1 and H2.
The formula to calculate the total amount of working hours is:
H0 + (H1x100) + (H2x10000)= Total working hours.
8.7.5 Number of hours to rotate primary
The primary appliance will rotate after 100 operating hours.
The rotation will take place when there is no flow through the
water heater.
NOTE: In systems where a re-circulation pump is installed:
ensure the pump is connected to a timer and turned off for at
least 1 hour every day. This will stop flow through the water
heater and allow rotation of the primary water heater.
8.7.6 Temperature set point change
The set point temperature limits are the same in a cascade as in
a stand alone appliance. The temperature set point is
transferred from the primary appliance onto the secondary
units.
8.7.7 Remote control usage
In this cascading configuration (Intelligent cascading) only one
remote control is needed to change the temperature set point
in the system. If the set point is changed in appliance the set
point will be updated in all appliances within 2 seconds.
The error code for the remote control is only displayed in the
appliance where the base unit is installed.
The base unit can be installed in any appliance, regardless
whether it is primary or secondary.
9 Commissioning
9.1 Factory regulations
Lead/lag changeover is not possible if the
water heater electronics are damaged or
connection is lost between the appliances.
The system will stop working if the
electronics in the primary are damaged.
Disconnect the damaged appliance and
select a new primary unit.
Operating hours
Number in H0 ________+
Number in H1 ______ (X100) ________+
Number in H2 ______ (X10000) ________+
Total of hours (H0+H1+H2)= _________
Table 13
Sealed components must not be opened.
DANGER: Serious personal injury!
▶ The following operations must be
carried out by a qualified and registered
Gas engineer.
… 38 …


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